Side Retainer

Install the bearing outer race to side retainer.
Install a new oil seal using ST and hammer.
ST 18675AA000 DIFFERENTIAL SIDE OIL

Fig 1: Installing Oil Seal Using ST And Hammer
Courtesy of SUBARU OF AMERICA, INC.
Apply gear oil to a new O-ring and install it.

Fig 2: Identifying O-Ring

Courtesy of SUBARU OF AMERICA, INC.